JPS63114624A - Molding apparatus of rotary molder - Google Patents

Abstract

PURPOSE:To make it possible to fix a cavity mold on a machine stand and consequently contrive to improve the molding cycle of a molder by a method wherein a lip mold is resiliently provided on the under surface of a transfer platen by means of a vertical shaft and a spring member in order to be able to move to a cavity mold together with a core mold, which is inserted through a hole part from an upper base platen, in such a manner as to open and close the molds. CONSTITUTION:After the stopping of a transfer platen 4 and the positioning of a lip mold above a cavity mold 9, a core mold is lowered through holes 7 and 8 in such a manner that firstly the mold surface at the tip of the core mold is positioned in the lip mold and at the same time the periphery of the tip contacts the lip mold and, after that, the lip mold together with a vertical shaft 12 is pushed by the core mold against a spring member down until the lip mold contacts the cavity mold, resulting in closing the molds. And, when the core old is raised, the lip mold returns to its initial position together with the vertical shaft 12 while being kept on contacting the core mold by means of the spring member, resulting in opening the molds. At this time, an injection-molded preform is released from a cavity mold while being pinched between the lip mold and the core mold and transferred to the transfer platen 4 side together with the lip mold as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a mold device for a rotary molding machine used in injection stretch blow molding of synthetic resin containers.

[Conventional technology]

A molding machine that successively performs injection molding of a preform and blow molding of a bottle and a container is already known from Japanese Patent Publication No. 53-22096.

(Problems to be Solved by the Invention) In the preform molding mold device of this known molding machine, the cavity mold is moved up and down with respect to the neck mold on the lower side of the upper base above the machine stand, and the gap between the molds is Because we are opening
When opening the mold, the nozzle of the injection device must be separated, which tends to cause the injection mold cycle to become long. Also, depending on the resin, stringiness or leakage may occur in the nozzle.

Therefore, attempts have been made to fix the cavity mold on the machine base and conversely move the neck mold side up and down, but in this case,
Since the neck mold must be moved up and down together with the transfer plate, the device becomes complicated due to the relationship with other operating parts, and the transfer plate must be rotated immediately after the mold is opened to move the preform together with the neck mold to the next stage. A new problem has arisen: it takes time to transfer the data to the operating section.

As a means to solve the above problems, a preform molding tool is developed in which the mold is opened and closed by vertically moving a holding mold that also serves as a molding mold on the outer periphery of the opening of the preform, without vertically moving the cavity mold and the transfer plate. In this device, as shown in Japanese Patent Application No. 60-270029, a vertical shaft that supports the holding mold in a vertically movable manner is attached to the lower surface of the transfer plate and extended downward. Therefore, if the blow mold is moved horizontally and the holding mold is moved horizontally by the rotation of the transfer plate, the vertical axis will hit the blow mold, making it difficult for the transfer plate to rotate. In contrast to the cavity mold, the blowing mold installed above had to be constructed so that it could be moved up and down.

An object of the present invention is to attach a lip mold to the lower surface of a transfer plate so as to be able to move up and down, while also allowing both a cavity mold and a blow mold for preform molding to be installed on the machine stand. The purpose of the present invention is to provide a mold device for a new rotary molding machine.

[Failure to solve the problem]

This invention for the above purpose comprises a cavity mold for preform molding which is mounted on the machine base, and a lip mold which also serves as a holding mold and which is attached to the lower surface of a rotatable transfer plate above the machine base together with a mold placement plate. and a core mold that passes through the transfer plate and fits into the lip mold. A spring member is provided between the connecting plate connected to the lower end and provided over the upper end of the vertical shaft and the transfer plate, and which presses the lip die and the mold placement plate to the lower surface of the transfer plate at all times via the vertical axis. It will solve the problem.

[For production]

In the above configuration, after the transfer plate is stopped and the lip mold is positioned above the cavity mold, when the core mold is lowered through the hole, the mold surface at the tip of the core mold is located inside the lip mold, and The periphery of the tip contacts the lip mold, and the lip mold, together with the vertical shaft, is pressed against the core mold against the spring member and descends until it contacts the gear and tee molds, and the mold is closed.

Further, when the core mold is raised, the lip mold also returns to its original position together with the vertical shaft while remaining in contact with the core mold by the spring member, and is moved between the molds. At this time, the injection-molded preform is released from the cavity mold while being held between the lip mold and the core mold, and is conveyed as it is to the transfer plate side together with the lip mold.

When the core mold is further raised and reaches its original position, only the preform remains held by the lip mold.

Further, the present invention will be specifically explained with reference to illustrated embodiments.

〔Example〕

In the figure, 1 is the machine stand, on which the lower base 2 is placed and fixed. Reference numeral 3 denotes an upper base provided above the platform, and a transfer plate 4 is rotatably attached to the lower side.

The upper base 3 is fixed to a plurality of supports 5 around the machine base, and the transfer plate 4 is rotated intermittently in 90° increments by a rotating device 6 provided at the center of the upper base 3.

The upper base 3 and the transfer plate 4 are provided with holes 7 and 8 of a required diameter that overlap each other at the stop position. Each device is arranged as an operation section for molding, temperature control, stretch blow molding, and mold release.

On the lower base 2 of the molding operation section, a cavity mold 9 for molding the bottom outer surface of the preform is mounted on a hot runner.
It is fixed together with the mold 10. Further, a blow mold 11 is installed on the lower base 2 of the stretch blow molding section so as to be able to close freely in the horizontal direction.

On the lower surface of the hole of the transfer 14, a pair of vertical shafts 12 are installed in parallel in the circumferential direction with the hole section 8 in between. The mold plate 4 is attached.

The vertical shaft 12 is connected to a connecting plate 1 provided over the upper end of each pair.
A spring member 17 is compressed and housed inside a receiving tube 16 that penetrates into the transfer ff14 below the connecting plate 15. The upper end of this spring member 17 is in contact with the connecting plate 15, and a pair of vertical @1
2 is always urged upward, and the mold placement plate 14 attached to the lower end of the vertical shaft 12 is pressed against the lower surface of the transfer plate 4.

18! The lip mold also serves as a retainer to form the outer periphery of the opening of the i-preform, and consists of a pair of split molds, each of which is attached to the center of the mold placement plate 14, and directly below the hole 8 of the transfer plate 4. It is set together with the mold placement plate 14 so that it can be opened and closed.

One is a core mold for molding the inner surface of the preform, and is attached to the lower side of a mold clamping member 21 that passes through the transfer plate 4 and spans the upper ends of a plurality of vertical mold clamping rods 20 located above and below. , located above the hole 7.8. The tip end surface of this one core mold fits into the inside of the lip mold 18 and forms a mold surface 1 together with the cavity mold 18.
9a, and the upper periphery of the mold surface 19a is the stepped portion 1.
9b so as to be in contact with the upper surface of the lip mold 18.

However, in the above M4 structure, when the transfer plate 4 is in a stopped state and the holes 7.8 overlap, the lower base plate 2
When the core mold 19 is moved in the mold opening direction together with the mold clamping rod 20 by the lower mold clamping cylinder 22, the core mold 19 reaches the lip mold 18 through the hole 7.8, and the mold surface 19a at the tip
is fitted into the lip mold 18, and the stepped portion 19b becomes the lip! 5218 and press it.

This causes the mold plate 14 to move along with the vertical shaft 12 to the spring member 17.
The cavity mold 9, the lip mold 18, the core mold 19, etc. move downward against the upper surface of the cavity mold 9 and close the mold.

A mold clamping force is applied to the mold closing, and molten resin is injected into the cavity from the injection device (No. 15 in the drawing) whose nozzle is constantly in contact with the gate of the Hola i-runner mold 10 to form a flat preform 23. After molding, mold clamping cylinder 2
When the mold is opened according to step 2 and one of the core molds is lifted up,
Due to the spring pressure of the mold placement plate 14 as well as the vertical @ 12, the lip mold 18 returns to the lower surface of the transfer plate 4 while remaining in contact with the stepped portion 19b of the core mold. At this time, since the frontage periphery of the preform 2j is sandwiched between the core mold surface 19a and the mold surface of the lip mold 18, it is released from the cavity mold 9 and placed in the lip mold 1.
Move to the transfer board side together with 8.

Furthermore, after the mold placement plate 14 comes into contact with the lower surface of the transfer plate, the core mold 19 is removed from the lip mold 18 and returned to its original position above the upper base plate 3. As a result, the preform 22 remains on the lip mold 1, as shown by the chain line in FIG.

The preform 22 is transferred to the transfer plate 3 as it is.
Due to the rotation of the lip mold 18, it is transferred to the stretch blow molding operation section via the temperature control operation section.

In the stretch blow molding operation section, a blow core 24 having a tip shape similar to that of the one core mold described above is provided above the upper base plate 3. This blowing core 24 is connected to an elevating device 26 using an air cylinder 25, and by the same operation as the core mold 19, the lip mold 18 is moved together with the mold placement plate 14 against the spring component material 17, and the mold is closed. Press it onto the top surface of 11. The preform 23 is then stretched in the axial direction by the stretching rod 27 at the center of the blowing core 24, and further expanded in the radial direction by air blowing from around the stretching rod. is omitted).

Further, the return of the lower surface of the transfer plate of the lip mold 18 after molding is caused by the return of the spring member 1 as the blowing core 24 returns after the mold is opened.
This is automatically carried out by the spring pressure of 7, and upon its return, the container is also transferred to the transfer plate side with the opening held by the lip mold 18. Then, the container is transferred to the next mold release operation section while being held between the lip molds 18 by the rotation of the transfer plate 4.

Although the illustrated preform 20 is flat, the preform can also be shaped in other shapes, and the movement dimension of the lip mold 18 is such that each operation part is in the intermediate position (when the preform 20 is in its original position).
3 and the lip mold 18 can be secured.

〔Effect of the invention〕

As described above, this invention allows the lip mold on the lower surface of the transfer plate to be inserted into the transfer plate so as to be movable to open and close with respect to the cavity mold, together with the core mold inserted from the upper part of the upper base through the hole. Since it is attached to the lower surface of the transfer plate using a vertical sleeve and a spring member that constantly presses the vertical axis upward, the cavity mold can be fixed on the machine base. Since the injection device can be kept in contact with the nozzle at all times, the molding cycle can be improved.

In addition, since the vertical shaft is always pressed upward so that it protrudes above the transfer plate when the transfer plate rotates, unlike the prior art in which the support shaft always protrudes below the transfer plate, the vertical axis when rotating Since there is no possibility of the blowing mold hitting the blowing mold, the blowing mold can also be installed on the machine stand, and the blowing mold lifting device can be omitted.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary molding mold apparatus according to the present invention, and FIG. 1 is a schematic longitudinal sectional front view of the rotary molding machine having the mold apparatus of the present invention, and FIG. 2 is a preform molding operation. FIG. 3 is a longitudinal sectional front view of the section, FIG. 3 is a longitudinal sectional side view thereof, and FIG. 4 is a longitudinal sectional side view of the mold in an open state. 1...Samadai, 2...Lower base, 3
... Upper base, 4... Transfer board, 7.8.
... Hole, 9... Cavity type, 11...
・Blowing type, 12... Vertical axis, 13...
Guide member, 14... Mold placement plate, 15... Connecting plate, 17... Spring member, 18... Lip mold, 19... Core mold.

Claims (1)

[Claims] A cavity mold for preform molding is installed on the machine base, a lip mold that also serves as a holding type is attached to the lower surface of the rotatable transfer plate above the machine base together with a mold placement plate, and In a mold for a rotary molding machine consisting of a core mold that fits into a lip mold, the mold placement plate is connected to the lower ends of a plurality of vertical shafts penetrating the transfer plate and can move up and down, and the upper ends of the vertical shafts Between the connecting plate provided over the area and the transfer plate,
A mold device for a rotary molding machine, characterized in that a spring member is provided which presses a lip mold and a mold placement plate against the lower surface of a transfer plate at all times via a vertical shaft.